package com.sort;

import com.oop.Fa;

public class So extends Fa {
  public static void main(String[] args) {
    //
    Fa fa1 = new Fa();
//    fa1.f(); // 变异报错  'f()' has protected access in 'com.oop.Fa'

    So so1 = new So();
    so1.f(); // 编译通过
  }
}
